docs(nebraska): add multi-step updates guide #523
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Add Multi-Step Updates documentation for Nebraska
This PR adds documentation for the multi-step updates (floor packages) feature. Should be merged together with the Nebraska release that includes this feature.
What are floor packages?
Floor packages are mandatory intermediate versions that Flatcar instances must install before proceeding to the final target version. This ensures safe update paths when breaking changes require instances to pass through specific versions (e.g., filesystem migrations, critical fixes).
Documentation covers: